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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulated Operations [Abstract] |
Schedule of Actual Capital Amounts and Ratios | The actual capital amounts and ratios are presented in the table below:
| Actual |  | For Capital Adequacy Purposes |  | To Be Well Capitalized Under Applicable Action Provisions
($ in thousands) | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | $ | 650,859 |  |  | 13.02 | % |  | $ | 399,949 |  |  | 8.00 | % |  | $ | — |  |  | — | %
Enterprise Bank & Trust | 611,197 |  |  | 12.26 |  |  | 398,969 |  |  | 8.00 |  |  | 498,711 |  |  | 10.00 |
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | 556,958 |  |  | 11.14 |  |  | 299,962 |  |  | 6.00 |  |  | — |  |  | — |
Enterprise Bank & Trust | 567,296 |  |  | 11.38 |  |  | 299,227 |  |  | 6.00 |  |  | 398,969 |  |  | 8.00 |
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | 489,301 |  |  | 9.79 |  |  | 224,971 |  |  | 4.50 |  |  | — |  |  | — |
Enterprise Bank & Trust | 567,239 |  |  | 11.37 |  |  | 224,420 |  |  | 4.50 |  |  | 324,162 |  |  | 6.50 |
Leverage Ratio (Tier 1 Capital to Average Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | 556,958 |  |  | 10.29 |  |  | 216,423 |  |  | 4.00 |  |  | — |  |  | — |
Enterprise Bank & Trust | 567,296 |  |  | 10.52 |  |  | 215,623 |  |  | 4.00 |  |  | 269,529 |  |  | 5.00 |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | $ | 589,047 |  |  | 12.21 | % |  | $ | 385,816 |  |  | 8.00 | % |  | $ | — |  |  | — | %
Enterprise Bank & Trust | 546,314 |  |  | 11.36 |  |  | 384,791 |  |  | 8.00 |  |  | 480,989 |  |  | 10.00 |
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | 496,045 |  |  | 10.29 |  |  | 289,362 |  |  | 6.00 |  |  | — |  |  | — |
Enterprise Bank & Trust | 503,312 |  |  | 10.46 |  |  | 288,593 |  |  | 6.00 |  |  | 384,791 |  |  | 8.00 |
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | 428,397 |  |  | 8.88 |  |  | 217,021 |  |  | 4.50 |  |  | — |  |  | — |
Enterprise Bank & Trust | 503,264 |  |  | 10.46 |  |  | 216,445 |  |  | 4.50 |  |  | 312,643 |  |  | 6.50 |
Leverage Ratio (Tier 1 Capital to Average Assets) |  |  |  |  |  |  |  |  |  |  |
Enterprise Financial Services Corp | 496,045 |  |  | 9.72 |  |  | 204,087 |  |  | 4.00 |  |  | — |  |  | — |
Enterprise Bank & Trust | 503,312 |  |  | 9.68 |  |  | 207,885 |  |  | 4.00 |  |  | 259,856 |  |  | 5.00 |

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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